Hi, I guess it's normal that the hugepages reserve memory even if on process is using them. I have the same situation, but I know having 16GB of memoory, I don't have enough to give 8GB to the hugepages, 8GB to the VM and 8GB to the host. So I think you are fine.
Alex On Mon, Jan 11, 2016 at 6:52 PM, sL1pKn07 SpinFlo <sl1pk...@gmail.com> wrote: > Hi > > I have add hugepages on my VM. but when launch the VM and run 'grep > Huge /proc/meminfo' on the host, the value is the same when the VM is > close > > i'm not sure if i missing any step > > in /etc/libvirt/qemu.conf: > > hugetlbfs_mount = "/dev/hugepages" > > in the VM XML: > > <memoryBacking> > <hugepages/> > </memoryBacking> > > in my system, Hugepages is mounted by systemd: > └───╼ systemctl |grep huge > dev-hugepages.mount > > loaded active mounted Huge Pages File System > > └───╼ mount |grep huge > hugetlbfs on /dev/hugepages type hugetlbfs (rw,relatime) > > └───╼ find /dev/hugepages > /dev/hugepages > /dev/hugepages/libvirt > /dev/hugepages/libvirt/qemu > > └───╼ ls -R /dev/hugepages > /dev/hugepages: > total 0 > drwxr-xr-x 3 root root 0 ene 11 17:14 . > drwxr-xr-x 19 root root 3880 ene 11 17:14 .. > drwxr-xr-x 3 root root 0 ene 11 17:14 libvirt > > /dev/hugepages/libvirt: > total 0 > drwxr-xr-x 3 root root 0 ene 11 17:14 . > drwxr-xr-x 3 root root 0 ene 11 17:14 .. > drwxr-xr-x 2 root kvm 0 ene 11 17:33 qemu > > /dev/hugepages/libvirt/qemu: > total 0 > drwxr-xr-x 2 root kvm 0 ene 11 17:33 . > drwxr-xr-x 3 root root 0 ene 11 17:14 .. > > └───╼ cat /etc/sysctl.d/10-kvm.conf > vm.nr_hugepages=6144 > > VM OFF > └───╼ grep Huge /proc/meminfo > AnonHugePages: 13309952 kB > HugePages_Total: 6144 > HugePages_Free: 6140 > HugePages_Rsvd: 0 > HugePages_Surp: 0 > Hugepagesize: 2048 kB > > VM ON (with some programs open) > └───╼ grep Huge /proc/meminfo > AnonHugePages: 13309952 kB > HugePages_Total: 6144 > HugePages_Free: 6140 > HugePages_Rsvd: 0 > HugePages_Surp: 0 > Hugepagesize: 2048 kB > > archlinux > Linux sL1pKn07 4.3.3-2-ARCH #1 SMP PREEMPT Wed Dec 23 20:09:18 CET > 2015 x86_64 GNU/Linux > libvirt from git 6e27701 > qemu from git ccd54b6 (from Gerd Hoffmann's branch (linux-imput)) > Windows10 guest installed before add hugepages options > > greetings > > _______________________________________________ > vfio-users mailing list > vfio-users@redhat.com > https://www.redhat.com/mailman/listinfo/vfio-users >
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